<template>
  <div class="app-container">
    <!--头部-->
    <mt-header class="header" fixed title="我的名字叫泡面·商城">
        <span  slot="left" @click="goBack" v-show="flag">
            <mt-button icon="back" >返回</mt-button>
        </span>
    </mt-header>

    <!--内容页-->
    <router-view></router-view>

    <!--底部-->

      <nav class="mui-bar mui-bar-tab">
          <router-link class="mui-tab-item-nb" to="/home">
              <span class="mui-icon mui-icon-home"></span>
              <span class="mui-tab-label">首页</span>
          </router-link>
          <router-link class="mui-tab-item-nb" to="/member">
              <span class="mui-icon mui-icon-contact"></span>
              <span class="mui-tab-label">会员</span>
          </router-link>
          <router-link class="mui-tab-item-nb" to="/shopcar">
              <span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span id="totalnum" class="mui-badge">{{ $store.getters.calcTotal }}</span></span>
              <span class="mui-tab-label">购物车</span>
          </router-link>
          <router-link class="mui-tab-item-nb" to="/search">
              <span class="mui-icon mui-icon-search"></span>
              <span class="mui-tab-label">搜索</span>
          </router-link>
      </nav>
  </div>
</template>

<script>
    export default {
        data(){
            return {
                flag:false
            }
        },
        created(){
            //由于刷新的时候，路由是子路径，但是已经重新加载了，flag变为false
            if(this.$route.path == "/home"){
                this.flag = false;
            }else{
                this.flag = true;
            }
        },
        methods:{
            //返回
            goBack(){
                // 点击后退
                this.$router.go(-1);
            }
        },
        watch:{
            //监听路由的变化，如果是主页，那就不显示返回
            "$route.path":function(newVal){
                if(newVal == "/home"){
                    this.flag = false;
                }else{
                    this.flag = true;
                }
            }
        }
    }
</script>


<style scoped>
    .app-container{
        padding-top: 40px;
        padding-bottom: 50px;
    }
    .mint-header{
        z-index: 99 !important;
    }


    * { touch-action: pan-y; }


    /*图片中滑动模块有问题，需要改这边的class=>mui很菜，我更菜 */
    .mui-bar-tab .mui-tab-item-nb.mui-active {
        color: #007aff;
    }

    .mui-bar-tab .mui-tab-item-nb {
        display: table-cell;
        overflow: hidden;
        width: 1%;
        height: 50px;
        text-align: center;
        vertical-align: middle;
        white-space: nowrap;
        text-overflow: ellipsis;
        color: #929292;
    }

    .mui-bar-tab .mui-tab-item-nb .mui-icon {
        top: 3px;
        width: 24px;
        height: 24px;
        padding-top: 0;
        padding-bottom: 0;
    }

    .mui-bar-tab .mui-tab-item-nb .mui-icon~.mui-tab-label {
        font-size: 11px;
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
    }
</style>
